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I have setup a PC, I've installed an ASUS PROB550M-C, with this passive cooler (used on three other PCS never had a problem)

enter image description here

I have disabled TPM and secure boot, I have set the fan monitor speed to ignore (otherwise the boot said CPU fan error press F1)

The PC boots… But only into BIOS, my disks are ignored and shows the BIOS screen like as I press F2 (but, of course I don't press F2)!

No way to boot? I have tried to boot from UEFI CD and UEFI hard disk, now I try a legacy USB...

P.S. Answers with something like “…use a CPU fan silent lower RPM from…” and similar are not accepted, sorry, I hate noise, even low.

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    I read your post carefully. You may wish to enable the Fan as a test and see if that allows the computer to boot.
    – anon
    Commented Jan 28, 2023 at 23:10
  • All my other motherboards (Asus m5a97, Asrock b450m) boot all without cpu fan, why this don't boot?
    – elbarna
    Commented Jan 28, 2023 at 23:22
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    I don't know (and cannot know) exactly. Computers are sensitive to heat, so I am making a "trial and error" type of suggestion
    – anon
    Commented Jan 28, 2023 at 23:24
  • Thanks for answer, was only a problem with uefi.
    – elbarna
    Commented Jan 29, 2023 at 0:38
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    Since UEFI has been standard on computers for nearly a decade, that solution may work for you but it not a useful broad based solution. UEFI and Secure Boot are needed for Windows 11 and Windows 10 support is ending in 2 years.
    – anon
    Commented Jan 29, 2023 at 0:42

1 Answer 1

Reset to default
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Workaround found: I have enabled CSM (Compatibility Support Module) in BIOS with all my mod option (control fan ignored).

Now boot fine in legacy mode (I don't care about UEFI, the important thing is to boot).

This workaround works on Linux (Slackware 15.0), I don't know what happens on Windows because I don't use Windows for decades.

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  • I suggest you start caring about UEFI. You are peeing against the wind.
    – Bob Goddard
    Commented Jan 29, 2023 at 12:52

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